<template>
  <div class="demo">
    <h1>{{ msg }}</h1>
  </div>
</template>

<script>
    export default {
        name:'My',
        data(){
            return {
                msg: 'Hello Vue!'
            }
        }
    }
</script>

<style>
  .demo {
    background-color: greenyellow;
  }
</style>